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See photos and videos on Columbia River and Willamette River.

See also Oregon Rivers.  The book Rivers of North America, edited by Arthur C. Benke and Colbert E. Cushing, contains chapters  on the Willamette and Columbia Rivers.  The text indicates that knowledge of aquatic insects and other macroinvertebrates is limited in these large rivers.  Discussions are given at the Order level (mayflies and stonefles are present), Family level (Chironomids are present) and to the  Genus level (Hydropsyche are abundant near a pulp mill).  Detailed studies seem to be unavailable according to the chapters, but check this report:. 

[PDF] A Brief Survey of Aquatic  File Format: PDF/Adobe Acrobat - View as HTML
Oregon Department of Fish and Wildlife. Columbia River Investigations ... In large river systems, invertebrates are the principal processors of organic ...
www.portlandonline.com/bes/index.cfm?&a=76769

I personally find that more information would be interesting, so I will add a number of photos and collection results as I visit more sites.  Again, see Oregon Rivers. 

Columbia River and other scenery


Oregon Gorge and Coast.pdf

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Aquatic Insects, more to follow:

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Mayflies- Ephemeroptera

Heptageniidae

Cinygmula reticulata McDunnough

see also: www.insecta.bio.pu.ru/z/Eph-spp/%7Dreticulata(Cinygmula).htm

This species is common in Oregon and is a dominant member of the communities of many small streams in the Coast Range and medium sized rivers such as the Metolius River in the Oregon Cascades. The following two websites found by internet search indicate that relatively little is known about the distribution or life cycle of the species, but it is noted that Lehmkuhl and Anderson (1970) reported some information on the life cycle.

www.npwrc.usgs.gov/resource/distr/insects/mfly/or/503.htm

www.troutnut.com/hatch/529/Mayfly-Cinygmula-reticulata-Western-Ginger-Quill

In going through my notebooks I found the following - still hand drawn- life cycles of C. reticulata in Oregon.


Cinygmula reticulata Oregon Oak Cr. Metolius Land.pdf

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Misc.

Stump with fungi in winter